Android - Sphero - CalledFromWrongThreadException

Question

我正在制作一款使用Sphero机器人球的游戏.当游戏启动/恢复时,它会检查配对或连接的球.如果蓝牙关闭,或者没有球配对,它会隐藏连接窗口.如果有球配对但未连接,则进入此功能.

// If the user clicked a Sphero and it failed to connect, this event will be fired
@Override
public void onRobotConnectionFailed(Robot robot) {
    Log.d("activity", "onRobotConnectionFailed");
    removeConnectionView();
}

它在以下方法中崩溃.

private void removeConnectionView() {
    mFrameLayout.removeView(mSpheroConnectionView);
    mSpheroConnectionView = null;
}

此功能适用于其他可能的结果.这是错误.

Thread [<14> Thread-2606] (Suspended (exception ViewRootImpl$CalledFromWrongThreadException))   
<VM does not provide monitor information>   
ViewRootImpl.checkThread() line: 5031   
ViewRootImpl.invalidateChildInParent(int[], Rect) line: 998 
FrameLayout(ViewGroup).invalidateChild(View, Rect) line: 4358   
ImageView(View).invalidate(boolean) line: 10565 
ImageView(View).invalidate() line: 10520    
ImageView.invalidateDrawable(Drawable) line: 202    
XDrawable(Drawable).invalidateSelf() line: 382  
XDrawable(Drawable).setVisible(boolean, boolean) line: 578  
ImageView.onDetachedFromWindow() line: 1196 
ImageView(View).dispatchDetachedFromWindow() line: 12136    
FrameLayout(ViewGroup).dispatchDetachedFromWindow() line: 2824  
RelativeLayout(ViewGroup).dispatchDetachedFromWindow() line: 2824   
SpheroConnectionView$SpheroItemView(ViewGroup).dispatchDetachedFromWindow() line: 2824  
SpheroConnectionView$SpheroListView(ViewGroup).dispatchDetachedFromWindow() line: 2824  
SpheroConnectionView(ViewGroup).dispatchDetachedFromWindow() line: 2824 
FrameLayout(ViewGroup).removeViewInternal(int, View) line: 3943 
FrameLayout(ViewGroup).removeViewInternal(View) line: 3918  
FrameLayout(ViewGroup).removeView(View) line: 3850  
discgroove.removeConnectionView() line: 233 
discgroove.access$4(discgroove) line: 232   
discgroove$2.onRobotConnectionFailed(Robot) line: 191   
SpheroConnectionView$4.onRobotConnectionFailed(Robot) line: 157 
RobotProvider.update(Observable, Object) line: 570  
Robot(Observable).notifyObservers(Object) line: 138 
Robot.setConnected(boolean) line: 300   
DeviceConnection$4.run() line: 378  

Answer 1

从一个不是主Looper线程(或"UI线程")的线程调用removeConnectionView方法.视图只能从主循环线程修改.

为了解决这个问题,请在主Looper线程上实例化一个Handler(例如在创建视图或Activity时),并使用该Hander#post(Runnable)方法调用您的方法,或者View#post(Runnable)在FrameLayout上使用该方法.

第一类示例:

将它放在Activity的onCreate方法中,该方法始终在主Looper线程中运行.

mHandler = new Handler();

然后,当您想要运行该方法时:

    handler.post(new Runnable() {
        @Override
        public void run() {

            mFrameLayout.removeView(mSpheroConnectionView);
            mSpheroConnectionView = null;
        }
    });

第二种示例:

    mFrameLayout.post(new Runnable() {
        @Override
        public void run() {
            mFrameLayout.removeView(mSpheroConnectionView);
            mSpheroConnectionView = null;
        }
    })